Kortmann, C.A.J.M.
Kluwer Law International, 2007
Buku Teks
Heldeweg, Michiel A
Wolters Kluwer Law & Business, 2012
Buku Teks
Kortmann, C.A.J.M.
Kluwer Law International, 2007
Buku Teks SO
Taylor, Benjamin J.
Prentice-Hall, 1987
Buku Teks SO
Jackson, Grdon E.
Prentice-Hall, 1993
Buku Referensi